Commenced in January 2007
Paper Count: 30135
Effects of Free-Hanging Horizontal Sound Absorbers on the Cooling Performance of Thermally Activated Building Systems
Abstract:Thermally Activated Building Systems (TABS) have proven to be an energy-efficient solution to provide buildings with an optimal indoor thermal environment. This solution uses the structure of the building to store heat, reduce the peak loads, and decrease the primary energy demand. TABS require the heated or cooled surfaces to be as exposed as possible to the indoor space, but exposing the bare concrete surfaces has a diminishing effect on the acoustic qualities of the spaces in a building. Acoustic solutions capable of providing optimal acoustic comfort and allowing the heat exchange between the TABS and the room are desirable. In this study, the effects of free-hanging units on the cooling performance of TABS and the occupants’ thermal comfort was measured in a full-scale TABS laboratory. Investigations demonstrate that the use of free-hanging sound absorbers are compatible with the performance of TABS and the occupant’s thermal comfort, but an appropriate acoustic design is needed to find the most suitable solution for each case. The results show a reduction of 11% of the cooling performance of the TABS when 43% of the ceiling area is covered with free-hanging horizontal sound absorbers, of 23% for 60% ceiling coverage ratio and of 36% for 80% coverage. Measurements in actual buildings showed an increase of the room operative temperature of 0.3 K when 50% of the ceiling surface is covered with horizontal panels and of 0.8 to 1 K for a 70% coverage ratio. According to numerical simulations using a new TRNSYS Type, the use of comfort ventilation has a considerable influence on the thermal conditions in the room; if the ventilation is removed, then the operative temperature increases by 1.8 K for a 60%-covered ceiling.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1339756Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 672
 EEA. (2001). End-user GHG emissions from energy. Reallocation of emissions from energy industries to end users 2005-2009. European Environment Agency Report No 19/2001.
 Babiak, J., Olesen, B. W., & Petras, D. (2013). Low Temperature Heating and High Temperature Cooling, REHVA Guidebook, vol. 7, 2009.
 S.P. Banbury (1998), D.C. Berry, “Disruption of Office-Related Tasks by Speech and Office Noise”. British Journal of Psychology, 89 (3), 499-517.
 Muet, Y. Le, Peperkamp, H., & Machner, R. (2013). Combining thermally activated cooling technology (TABS) and high acoustic demand: Acoustic and thermal results from field measurements, Inter-Noise, International Congress, and Exposition on Noise Control Engineering, Innsbruck, 15-18 September 2013.
 Ecophon. (2015). Knowledge guide. Sound absorption – free-hanging units vs. full ceiling.
 Ecophon. (2015). Ecophon Master TM Matrix Technical datasheet.
 ISO 7726:2012, Ergonomics of the thermal environment. Instruments for measuring physical quantities. ISO 2012
 Domínguez, L. M. (2016). Influence of Acoustic Ceiling Units on the Cooling Performance of Thermo-Active Building Systems (TABS), (February).
 Weitzmann, P. (2004). Modelling building integrated heating and cooling systems. PhD dissertation, Dept. of Civil Engineering, Technical University of Denmark, Lyngby.
 Rage, N. (2015). Experimental and theoretical study of the influence of acoustic panels on the heat exchange between Thermo-Active Building Systems (TABS), the occupants and the room, (July).